Apparatus for diagnosing vehicle-mounted battery

Details Apparatus for diagnosing vehicle-mounted battery Apparatus for diagnosing vehicle-mounted battery

1989-02-24

1991-02-19

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

324427, 324429, G01R 3136

Patent

active

049947281

ABSTRACT:
An apparatus for diagnosing the residual charge of a battery mounted in a vehicle which utilizes an engine includes a comparator for comparing the terminal voltage of the battery with a reference voltage, a stoppage detecting circuit for detecting that the operation of the engine has stopped, a timer for determining that a predetermined time has elapsed since the stoppage detecting circuit detected that the operation of the engine stopped, and a determination circuit for determining the residual charge of the battery from the comparison result provided by the comparator when the timer determined that the predetermined time has elapsed.

REFERENCES:
patent: 3997888 (1976-12-01), Kremer
patent: 4025916 (1977-05-01), Arnold et al.
patent: 4553140 (1985-11-01), Maida
patent: 4608714 (1986-08-01), Juengel
patent: 4719427 (1988-01-01), Morishita et al.
patent: 4725784 (1988-02-01), Peled et al.

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